I am analysing some data on the impact of immigration on peoples attitudes to welfare. I wanted to use a difference in difference estimator as an exogenous shock caused immigration to drastically increase in regions in the given country. I wanted to create a difference in difference estimator by using a dummy variable for high immigration regions, with yr*high_immigration the coefficient of interest, as well as having regional control variables to control for participation and individual response. I was finding it hard to explain this since even though I have manipulated the data into having a control and treatment group, the control group still has a level of treatment.


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